Extensions are like apps for your browser.

They add features to Firefox to make browsing faster, smarter, or just plain fun.

Featured extensions
  • Video Background Play Fix

    Video Background Play Fix

    Some sites may not work with Firefox for Android video background play feature. This add-on provides a quick fix by blocking the Page Visibility API and the Fullscreen API.

    29,139 users

  • Cookie AutoDelete

    Cookie AutoDelete

    Control your cookies! This WebExtension is inspired by Self Destructing Cookies. When a tab closes, any cookies not being used are automatically deleted. Whitelist the ones you trust while deleting the rest. Support for Container Tabs.

    206,622 users

  • Ghostery – Privacy Ad Blocker

    Ghostery – Privacy Ad Blocker

    Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.

    1,175,735 users

  • Decentraleyes

    Decentraleyes

    Protects you against tracking through "free", centralized, content delivery. It prevents a lot of requests from reaching networks like Google Hosted Libraries, and serves local files to keep sites from breaking. Complements regular content blockers.

    176,837 users

Productivity extensions
  • Gesturefy

    Gesturefy

    Customizable mouse gesture add-on, which supports over 60 different commands and additional features like rocker and wheel gestures.

    116,268 users

  • Clippings

    Clippings

    Save frequently-entered text for pasting later.

    33,857 users

  • Tomato Clock

    Tomato Clock

    Tomato Clock is a simple browser extension for managing your productivity.

    16,049 users

  • Impulse Blocker

    Impulse Blocker

    Block distracting websites when you are browsing the web. You can list websites that you don't want to visit in the settings. You can pause or turn off the blocker quickly. Completely open source.

    6,435 users

Featured themes
YouTube boosters
  • Enhancer for YouTube™

    Enhancer for YouTube™

    Tons of features to improve your user experience on YouTube™.

    506,174 users

  • Turn Off the Lights

    Turn Off the Lights

    The entire page will be fading to dark, so you can watch the videos as if you were in the cinema. Works for YouTube™ and Beyond. It works for all known video sites such as YouTube, Vimeo, Twitch, Dailymotion, Facebook, Hulu, Metacafe, YouKu, etc.

    42,732 users

  • Iridium for YouTube

    Iridium for YouTube

    YouTube with more freedom

    14,670 users

  • SoundFixer

    SoundFixer

    Lets you fix annoying sound problems in YouTube videos and such. Like audio in one channel only, too quiet or too loud. (Unfortunately, doesn't work on many other websites because of cross-domain issues — but it does work on YouTube.com!)

    16,784 users

Feed readers
  • Brief

    Brief

    Brief makes reading RSS feeds as easy and intuitive as it gets. Designed to have exactly the right set of features, it is powerful and simple at the same time. Feeds are presented on a seamless, interactive page which let's you bookmark and tag items with a single click.

    12,106 users

  • RSSPreview

    RSSPreview

    Preview RSS feeds in browser

    4,698 users

  • Feed Preview

    Feed Preview

    Indicates available RSS and Atom feeds and renders previews.

    2,982 users

  • mPage

    mPage

    Simple dashboard-like RSS feed reader.

    721 users